Wrt Hollister being only 5% of the Ivanhoe property -- I think this is very significant. The Hollister JV area where the Gweneviere, Clementine and Velvet vien systems are located, roughly correspond to the old Velvet and Clementine mine workings. But there are many other old timer mine workings spead throughout the Ivanhoe property outside of the Hollister JV area, including the Rimrock Mine, Sheep Corral Mine, Old Timers Mine, Governor Mine and Fox Mine, in addition to the old Velvet and Clementine Mines, which could be indicative of many other high grade vien systems parallel and similar to the Clementine, Gweneviere and Velvet viens. In fact, there is no greater concentration of old timer mine workings on the Carlin Trend than this cluster of old workings on the Ivanhoe property; and it is a good bet IMO that these old workings were the result of surface expressions of just such other parallel tertiary viens of a much larger N,NW trending mineralized system similar to but orders of magnitude larger than Newmont's Midas operation -- just as Ken Snyder speculated when he visited the property.
Another interesting tidbit is that Newmont has apparently found much higher grade mineralization now at greater depth at the Ken Snyder/Midas operation - which would seem to bode well for GBN at Ivanhoe.
Wrt Hecla buying or renting additional trucks at Hollister to truck more ore and ramp up production: they will probably contract that out through TransSystems - so it will probably just be a simple matter of contracting for additional haulage. The only thing that I can see that would really limit their expansion in that regard is TransSystem's fleet capacity - and as you say, there's nothing to prevent them in such an event from buying or renting trucks themselves.
Wrt it being conceivable but not likely that GBN can internally finance Burnstone if necessary - I would say that this becomes more likely given higher gold prices.